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Your bike will run best on what the manufacturer says it should be run on. Compression ratio and the presense / non-presense of forced induction are the dictators of how much octane an engine needs. An overdose of octane will do nothing to aid starting or warming up. It's primary job is to inhibit pre-detonation. If you're not experiencing spark knock while climbing a hill on a hot day, you're running the correct fuel.
On the other hand, overuse of octane likely won't hurt anything besides your wallet. It seems to make some people feel better because they think they're giving their bike 'the best', so I suppose there's no price you can put on peace of mind. I prefer to seek out sources of fuel that has a reputation for cleanliness & consistency. If the retailer doesn't appear on the list of Top Tier providers, I don't buy gas from them.
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